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Power Systems

Power Systems
A loss less transmission line has a length of 600 km, find the phase shift of voltage signal?

 36°
 42°
 90°
 45°

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Power Systems
The time taken by the turbine to fall to 0 rpm speed from 3000 rpm is called

  settling time.
  stopping time.
  coasting time.
  damping time.

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Power Systems
The Y bus matrix of a 100 bus interconnected system is 90% sparse. Then find the number of non zero elements in the Y bus matrix?

 1000
 10
 9000
 90

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Power Systems
The characteristic impedance of a transmission line is

 Independent of its length.
 Inversely proportional to square root of its length.
 Directly proportional to square root of its length.
 Directly proportional to its length.

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Power Systems
The draw back of NR method as compare to Gauss-Seidel method is/are?

 large requirement of computer memory
 both 1 and 2
None of these
 large number of iterations

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Power Systems
A 1- phase transmission line operating at 30 kV has radius of 1 cm and distance between conductors is 0.5 m. Assume m = δ =1, g = 21 kV/cm and frequency f = 50 Hz. Find the critical disruptive voltage?

 34.64 kV/phase
 82.15 kV/phase
 17.32 kV/phase
 41.075 kV/phase

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